runtime checks for pil and pyqt to allow for easy cli-only on some systems

git-svn-id: http://comictagger.googlecode.com/svn/trunk@91 6c5673fe-1810-88d6-992b-cd32ca31540c

comicvinetalker.py

@@ -25,8 +25,11 @@ import urllib2, urllib
 import math 
 import re
 
-from PyQt4.QtNetwork import QNetworkAccessManager, QNetworkRequest
-from PyQt4.QtCore import QUrl, pyqtSignal, QObject, QByteArray
+try:
+	from PyQt4.QtNetwork import QNetworkAccessManager, QNetworkRequest
+	from PyQt4.QtCore import QUrl, pyqtSignal, QObject, QByteArray
+except ImportError:
+	pass
 
 import utils
 from settings import ComicTaggerSettings

imagehasher.py

@@ -1,7 +1,14 @@
 
-import Image
 import StringIO
 
+try: 
+	import Image
+	pil_available = True
+except ImportError:
+	pil_available = False
+
+
+
 class ImageHasher(object):
 	def __init__(self, path=None, data=None, width=8, height=8):
 		#self.hash_size = size

issueidentifier.py

@@ -22,7 +22,11 @@ import sys
 import math
 import urllib2, urllib
 import StringIO
-import Image
+try: 
+	import Image
+	pil_available = True
+except ImportError:
+	pil_available = False
 
 from settings import ComicTaggerSettings
 from comicvinecacher import ComicVineCacher
@@ -203,10 +207,15 @@ class IssueIdentifier:
 		ca = self.comic_archive
 		self.match_list = []
 		self.cancel = False
-
+		self.search_result = self.ResultNoMatches
+		
+		if not pil_available:
+			print "Python Imaging Library (PIL) is not available and is needed for issue identification."
+			return self.match_list
+			
 		if not ca.seemsToBeAComicArchive():
 			self.log_msg( "Sorry, but "+ opts.filename + "  is not a comic archive!")
-			return self.ResultNoMatches, []
+			return self.match_list
 		
 		cover_image_data = ca.getCoverPage()
 		cover_hash = self.calculateHash( cover_image_data )